If you look at the ingredients for Alka-Seltzer, you will find that it contains citric acid and sodium bicarbonate (baking soda). When you drop the tablet in water, the acid and the baking soda react -- this produces the fizz.
Shake and Bake A new and increasingly widespread technique also known as one pot, this condenses the anhydrous method's many steps and requires only a plastic soda bottle, the size of which depends on the quantity of meth the cook intends to make.
Shake the meat. Chicken legs or thighs and pork chops are the most common meats for shake and bake. For each 1 lb. (450 g) of meat you'll need 3/4 cup (175 ml) of shake and bake. Pour the necessary amount of shake and bake into a clean plastic bag.